Project Title: Smart Gas Safety Device – ESP32 + Multi-Gas Detection + Auto Ventilation (180-250V AC) + GSM Alerts + Mobile App (Production Ready) Project Description: Hi, I’m looking for a solid embedded engineer or small team to build a real, production-ready smart gas safety system. This isn’t a quick prototype — it’s for actual use in homes, workshops or small factories, so safety and reliability come first. What the device needs to do: • Detect combustible gases, CO, toxic gases, smoke and fire (using MQ-2, MQ-7, MQ-135, flame sensor + temp/humidity) • Use smart logic (sensor fusion + optional TinyML) to cut false alarms • Automatically switch on a 180–250V AC fan to clear out bad air • Send alerts via GSM: SMS + auto phone calls (must work fully offline, no WiFi needed) • Connect via WiFi to a simple Flutter mobile app for real-time monitoring, history and manual fan control Main parts (you can suggest better choices): • ESP32-WROOM-32 as brain • SIM800L for GSM • Proper isolated AC-DC power (HLK-PM01 style) • Relay for high-voltage fan control • Safety stuff: fuses, MOV, TVS, optocouplers, EMI filter • Buzzer + LEDs • Optional: battery backup or gas valve control What I need from you (full scope): 1. Complete schematic + production-ready PCB (KiCad or EasyEDA, 2-4 layers, good isolation for AC) 2. Firmware on ESP32 (FreeRTOS, sensor handling, decision logic, GSM SMS/calls, fail-safe mode) 3. TinyML (TensorFlow Lite Micro) for better false-alarm reduction – strongly preferred if you have experience 4. Simple Flutter mobile app (dashboard, alerts, manual override, history) 5. Nice 3D enclosure design (wall/ceiling mount, good airflow) – STL + STEP + renders 6. Full manufacturing package: BOM with prices, assembly guide, test/calibration steps, docs Safety is critical: • Proper galvanic isolation between AC and low voltage • Creepage/clearance, surge protection • Fail-safe (fan defaults safe on fault) • Ready for basic CE-type compliance thinking Deliverables summary: • Editable schematic & PCB files + Gerbers/Pick&Place • Clean, documented firmware code • Working GSM alerts (SMS + calls) • TinyML model + notes (if done) • Flutter app source code • 3D files + renders • Complete BOM, docs, test procedures Timeline & Budget: Please quote a fixed price (preferred) and break it down roughly like: • Hardware + PCB • Firmware + GSM • TinyML (if included) • Mobile app • 3D design + docs • Total Also tell me: • How many weeks you estimate • Main milestones Who I’m looking for: • Strong ESP32 experience (show me similar projects) • Good with AC power safety & isolation (very important) • GSM/SIM800L work (SMS + calls) • Bonus: TinyML on microcontrollers + Flutter To apply: Send me: • Links to relevant past work (ESP32 + sensors/AC/GSM especially) • Quick note on your approach (especially AC safety + offline alerts) • Timeline + fixed-price quote Serious bids with portfolio only, please. This could turn into a commercial product, so quality matters a lot. Thanks! Looking forward to hearing from you.